Skip to main content


128K x 36 Async, 3.3V/2.5V Dual-Port RAM, Interleaved I/O's

The 70T659 is a high-speed 128K x 36 Asynchronous Dual-Port Static RAM designed to be used as a stand-alone Dual-Port RAM or as a combination MASTER/ SLAVE Dual-Port RAM for 72-bit-or-more word system which would result in full-speed, error-free operation without the need for additional discrete logic. An automatic power down feature controlled by the chip enables (either CE0 or CE1) permit the on-chip circuitry of each port to enter a very low standby power mode.


  • Dual-Port allows simultaneous access of the same memory location
  • RapidWrite Mode simplifies high-speed consecutive write cycles
  • Dual chip enables allow for depth expansion without external logic
  • Easily expands data bus width to 72 bits or more using the Master/Slave select when cascading more than one device
  • Busy and Interrupt Flags
  • On-chip port arbitration logic
  • Full on-chip hardware support of semaphore signaling between ports
  • Fully asynchronous operation from either port
  • Separate byte controls for multiplexed bus and bus matching compatibility
  • Sleep Mode Inputs on both ports
  • Includes JTAG functionality
  • Single 2.5V (±100mV) power supply for core
  • LVTTL-compatible, selectable 3.3V (±150mV)/2.5V (±100mV) power supply for I/Os and control signals on each port
  • Available in a 256-ball BGA, 208-pin PQFP and 208-ball fpBGA.
  • Industrial temperature range (–40C to +85C) is available

Product Specification

Core Voltage (V)Bus Width (bits)Density (Kb)Pkg. CodeInterfaceI/O TypeAccess Time (ns)I/O Frequency (MHz)Temp. RangeArchitectureOrganizationFunctionOutput Type
2.5364608BC256, BF208, DR208, BFG208Async2.5 V LVTTL, 3.3 V LVTTL8, 10, 12, 15-40 to 85°C, 0 to 70°CDual-Port128K x 36Busy, Sleep Mode, Interrupt, JTAG, Master, Slave, Semaphore

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeCarrier TypeSample & Buy
70T659S10BCActiveBC256CABGATrayCheck Availability
70T659S10BC8ActiveBC256CABGAReelCheck Availability
70T659S10BCIActiveBC256CABGATrayCheck Availability
70T659S10BCI8ActiveBC256CABGAReelCheck Availability
70T659S10BFNot Recommended
BF208CABGATrayCheck Availability
70T659S10BF8Not Recommended
BF208CABGAReelCheck Availability
70T659S10BFIActiveBF208CABGATrayCheck Availability
70T659S10BFI8ActiveBF208CABGAReelCheck Availability
70T659S10DRActiveDR208PQFPTrayCheck Availability
70T659S12BCActiveBC256CABGATrayCheck Availability
70T659S12BC8ActiveBC256CABGAReelCheck Availability
70T659S12BCIActiveBC256CABGATrayCheck Availability
70T659S12BCI8ActiveBC256CABGAReelCheck Availability
70T659S12BFNot Recommended
BF208CABGATrayCheck Availability
70T659S12BF8Not Recommended
BF208CABGAReelCheck Availability
70T659S12BFIActiveBF208CABGATrayCheck Availability
70T659S12BFI8ActiveBF208CABGAReelCheck Availability
70T659S12DRActiveDR208PQFPTrayCheck Availability
70T659S12DRINot Recommended
DR208PQFPTrayCheck Availability
70T659S15BCActiveBC256CABGATrayCheck Availability
70T659S15BC8ActiveBC256CABGAReelCheck Availability
70T659S15BFNot Recommended
BF208CABGATrayCheck Availability
70T659S15BF8Not Recommended
BF208CABGAReelCheck Availability
70T659S15DRActiveDR208PQFPTrayCheck Availability
70T659S8BCObsoleteBC256CABGATrayCheck Availability
70T659S8BC8ObsoleteBC256CABGAReelCheck Availability
70T659S8BFObsoleteBF208CABGATrayCheck Availability
70T659S8BF8ObsoleteBF208CABGAReelCheck Availability
70T659S8BFGObsoleteBFG208CABGATrayCheck Availability
70T659S8BFG8ObsoleteBFG208CABGAReelCheck Availability


Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
70T651/9 Data Sheet Datasheet PDF 739 KB Jul 22, 2015
Apps Notes & White Papers
AN-59, Using 7024/7025 DP SRAMs to Match System Bus Widths Application Note PDF 89 KB May 31, 2006
AN-70, Dual-Port Interrupt Expansion Application Note PDF 56 KB May 31, 2006
AN-91, The Most Commonly Asked Questions About Async Dual-Ports Application Note PDF 87 KB May 31, 2006
show all (5)
AN-14, Dual-Port w/ Semaphore Arbitration Application Note PDF 71 KB May 30, 2006
AN-253, Introduction to Multi-Port Memories Application Note PDF 36 KB May 30, 2006
PCN#: A-0410-02, Change IDT marking logo with new IDT gridless w Product Change Notice PDF 24 KB Nov 14, 2012
PCN# A-0607-05 Green Mold Compound KMC3580 for BGA Product Change Notice PDF 194 KB Aug 30, 2006
PCN#: TB-0512-01 Reel Color Changed from Blue to Black Product Change Notice PDF 729 KB Dec 16, 2005
show all (9)
PCN# A-0506-01: New m/c G700 & d/a 8361J for PQFP Product Change Notice PDF 16 KB Aug 12, 2005
PCN A-0506-03; Packing Material Change Product Change Notice PDF 290 KB Jul 19, 2005
PCN#: A-0412-04 - To comply with Pb-free labels - Green Products Product Change Notice PDF 80 KB Dec 14, 2004
PCN#: A-0403-03, BGA package family Product Change Notice PDF 38 KB Dec 9, 2004
PCN#: A-0310-01, Green Products Product Change Notice PDF 26 KB Oct 10, 2003
PCN#:A-0305-02, new m/c G770 & 2300 d/a material Product Change Notice PDF 197 KB Jun 4, 2003

Software & Tools

Title Type Format File Size Datesort icon
IDT70T659 BSDL Model Model - BSDL ZIP 9 KB Feb 24, 2004
70T659 Verilog Model Model - Verilog TXT 66 KB May 20, 2004
IDT70T659 IBIS Model Model - IBIS ZIP 54 KB Feb 24, 2004
70T659 VHDL Model Model - VHDL TXT 16 KB May 20, 2004